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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387d60ae86b9202059e643b358c363860306da21de27977d58e37d4b5238308f' 
  AND token = 'aNFBDGIbFM1Xtx1NWuFfr2/q3xtdw8kYYtCb4IB352E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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