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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b379e255bb589319acda28c7aeb9c3ab1116b93e221a948a7bd76122618698d' 
  AND token = 'Yp/9r3nVWa3hgZsT4jBl9/Bu+FQL/L8cZK90OLEkMWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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