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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae8eb68abe9d89c712f8729a7f09b534bfe0772fc7d66e5d6ebe4b009a43458' 
  AND token = 'fE90xiuRFLQ19e0S1JADzsXizifJWRh6L6/QGES+TDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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