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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcee98ddec09d254d86033f7c00ba5e0f2c3e30ded820863b7239e0fffaae99' 
  AND token = 'zBJNSYVJjA19hV787M1nZdOJz6zQrmJ2B6skzQCE4+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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