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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63606abbe8fd7d87cb798d5b6e39bfcfb1cf3888d0c3f1c2e1d355e4cee61430' 
  AND token = 'dcYfrGCIPBmN2jKIXeVkh6Rns5KU9L4foCTXBa+YtZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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