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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cd5f247d907b3e08c3c6f2cb3e972649cda883a91ea92365c54115f9de3460' 
  AND token = 'cVwbNLtGJIo8lZ7R2N3kbmb5bdMB5HpGgdxio+OAW8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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