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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57b10121cfb22a8847df174a82f1c653b5cb5c65e1c98a0f7664742b7096787' 
  AND token = 'wZ0BAWe5u2cgO9T94QPe0dCfsWHzLfYvyMcrdd1fzVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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