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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea98e7645da3d9a2f91361054d955994720ca604ff555964327576eeaa6d58a' 
  AND token = 'au43KY/AMcAM1MuVdGHnZMIZiSTa3C+9I15Az7NSlq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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