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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94bebcb66bcc77c7b7a68bf23535992c86be69f76d48eab530c6054bed2e0b5' 
  AND token = 'I+WdSEJ4w8FlQAmRHfN4biga2pbA1xFHdVvNW+Gn2g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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