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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e11b6b92c2e5f087116d5dcae71b7db0f680b55210c01d794025bc731fdb4a' 
  AND token = 'WxcbVsJqA3fd9YsaQFmMAyC4+yhN9TFOxTfGla6jBcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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