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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de348414a72aab3ef30efde18dc5e7739f77c0a43293cf6f102e4e3876bebe7' 
  AND token = 'frupafuN7v9iry9DKGrTnJ6FvB2FDl8tFJMG2vLJTtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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