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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b18d17661fd7b2187f744b071cfd0dc6a80540304c11bc66585261fb643675' 
  AND token = 'CdXegUHdro23jRgPHUXFGF1FgvbmI8kzK+nGQ0o+2Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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