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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318b9eb9bd29f633015310a89b8b420c7ba4c50b139f7bf2d03d0f6ba0d7bafb' 
  AND token = 'UICoCF449y2xdfF+bt4/FzUn22e1OW8AsG3ZhwwP/ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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