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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cea9d693c4da63d6e1cd083e6546e183e9025864cbbf09cd8b0825a5448864' 
  AND token = '4ylGPPq81OTRtSFQWb9Ob75iTbMX5kt6goBQL2iKCCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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