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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cc2d08c02dd628387a85699f22b2b80c15ea03d4725191291f2ba721525478' 
  AND token = 'K07U4xlVYGiOkWdL8aqcaC2wRLjocs/3auSxeA1GAmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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