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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b599f628b47d94e94f7471e019c940e2a05c92aa5032da34431e4119317938c' 
  AND token = '9rVwikZbpI9MjPStcJOlyEJbJYLQkHPSpe1WHNBl1Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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