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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c80f92a89c2fcc4bffbac6b20c514b675e7037bede00b3190383ff5e559f33' 
  AND token = 'ullvLr10eV3eDqHTLXmjOv04UWFdjXVucyJJ5Rf2H7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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