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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebe123ff688860807c64a44d2fbcb33f607003c923e7ca43e8268bfbad43201' 
  AND token = 'G3+mSyIaJ6kKs3rij/YdSDRKtHYueLS9G+HhgRb2FLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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