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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0023b94c239097d9c5e1fe7b951b7ac651f8e6469ec58f781dec86c81560815f' 
  AND token = 'tBo6cHipv9zaeJqPas7rtXE/ngeJDlue6yUngqQXVMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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