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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a2253a6ad4c8f542972e86dae5e93ff9d0e5b93920b8f8f92a45b0fec22d9f' 
  AND token = 'vIOV8I7Y/sLLpIBeGjnmemJ3uQ3Uk2+ZCvHN0CwIpQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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