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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03cc2ea8ee73b7ab45df5229f9f6d3bc98bfb5c6b6bd4e4a0c898290be9b85f' 
  AND token = '4lRVcx+Ufh5uoS4Bz6u4CqC8tQ+PNWSoPL3zX1t9/qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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