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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5457f5a6c76cb2a178a2803309845d4008ad3870b47fc0b29d34f255baa9317f' 
  AND token = '3narpIsNm3RuRCpx4gCawLhx6wFEwOmblXsv18fgSDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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