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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db6d7c9013c57e88ce2eefbb9690f8d582266ff0eec76df2cb706c3ed59223c' 
  AND token = '/ETQ9RAOc0fguqoboRqAxonS5eSJb7kAgufaWgC85gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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