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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c069523b28dae1368e3f356972f21ff3e8bce70a9775946431928d77aa370b0' 
  AND token = '9okSwPLoilZLbiMiX7t0mlUIfZZV8I9JaqD+e0bfJWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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