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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9172ab27b972e6bf530b14d673d093936198b1c15693c4322d6dc5b7b1930d48' 
  AND token = 'wTjGDx6I1XxVq5CQrndDVMTe08mSCOnkx4jl4TFKYow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}