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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb1e185082935546372920d8a478368eb5e7ceadb20d6d0ead8f695a8ecbd5d' 
  AND token = 'KwcYaduvrAvucBs9m+m/BTtZ84+KUFp+M0+RrRejlcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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