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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10661519763f3f3c35168344a611db5a6d386993c5da69fb0240ac5ad3430c4' 
  AND token = '8YOcGpG/s9aJx2f1fakN4KgjgZRnu/KT/y36A1Sl74k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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