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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17203fb2d5d062732b4b2c3f226fa8d8db33c1c91cf7eb770fd3f3c2431c3eb1' 
  AND token = '9imWs3VdOjAu7LADhFo0CUyaePypC5eyCE+gRE1m/Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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