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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cbb796b42de7c0afa2420ccb0518d7df19a86cf6322e30ffaa856fac80b807' 
  AND token = '90dc9tl/sx5f/LIs3Fi/Fy4bdO6ZsOFW9aQEUdE++T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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