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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b410faa64d53a176a729a7762666ba9bb07046600e5221f899d9e66ec8a11c7d' 
  AND token = 'mIfEFSbEi10XVBDcSvmL2u8Mgr7MSxw92qWAE9Ggb9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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