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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd533c67745be65fb5d071bfd71e469b03ab190f5662093fe53aab8d6b7b28d07' 
  AND token = 'B7fkzAer4MK0yI7ArPklCRMm/BCCG+Qz+sE+xwUP9uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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