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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c226016d350a590f543dd65abc82ad5ab350328761b8d715537ac3470203c0' 
  AND token = 'deAQYxfSTj+W6JPmx53uaaxsHMuDSs5zNU6b3s/C/UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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