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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fad8d266bf9b8d85be306cc9a713d5e2f8aeda24f43e1e1ca5ad80e0a417cee' 
  AND token = 'MkBPOGbxOWvZ3ItHZwH5GF3DC9OYgBsnP9mrSk0X4io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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