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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfe600712302452e5f041b352125b92759753aa921046c61f5ca42352341787' 
  AND token = 'MiJPI5HMMCp4zX/Squ1noT06T8we+5p75D6ftPm9hsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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