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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071a4cf1fd2f6a8f96b5ae0b8c97c8277295542a2e2ec2770c625b316c9a547a' 
  AND token = '56p8d9zzddBJ5MUQCJ4MnQmk5jM7MxJuxN5MX0GQVWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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