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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d115b889712e5739793ba74b5edcffe0bd77e0a8747972c6e23963bbf92c1ac' 
  AND token = 'DEymVXigUh5xkIdly3rJSoUA9lf5ukDmvh3a8OVMLFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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