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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89bcc482a17514f378335e763f681ac62beb5937ea6e28ff574a0b090f304554' 
  AND token = 'rblK24b7LJMhgyPRZ6omvy3Z+9i+e8V61Y5vq72X0w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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