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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902c84d76d5c968853d1015605d357f4d70f40dc7f43b546504b1dcbd88b6c48' 
  AND token = 'flwYmkYyBhdCk8oeL+nHNIaMeC/4c7WQNpGe30E/ZvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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