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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5788a073334a40781ba9ad420336ec41c569756b38d7ed5ff6856686322092' 
  AND token = 'wwv1/gkSSOM6LHgowGP/A3Dn/KjDCkF90pM07Gc6JIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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