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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3775d0ddfe28ffe3658a11c3fcc2fbf6591eb9b7cf60b1e68b24f53caab3881' 
  AND token = 'jIB/BWHOau4vhAs1bfSwDqxLISj2FiCS7kMvKraCO90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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