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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e328ce87d6f4d7f5ad5f3c3dd4e4f10086a7aecffef5d71a41e40dd07a5480a' 
  AND token = '2+4sb1PSBU+wLG+ykl1PeEbf98KcnJMufBCm8ZV8tgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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