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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657b8be62652fa9115b62d557f7d1de857f1169cc779ee6f90723ad0cfe2922b' 
  AND token = '36TmTEs//ol04KIJq8MGpAWJO6GSW6p2qtmSprSk7h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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