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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a47dba2a991eb3ddc36c0eab9016e2c975528200654763e5d2c0ab360b8228a' 
  AND token = '4aJzj5ux9RrdB0uD0KjWtk4YktAzrIuqKH6oH/JU2PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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