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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a4245954a64f9cad64b4be18040c7e38939a45280dd35a830601b3376a59f1' 
  AND token = 'aL868C3qbBuC2EAJShLmhnnZDBp7mwyTEPgHw+q7Xkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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