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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e29ea417c3ec15357b67051ddedec59de7743b287e7c8d512de483d87f368bc' 
  AND token = '7pv8KdI3MoJjSmOIuyOP/UgVpvxGR3sJ3Ok7F8l3cAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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