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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b238ed9a6dde7f1acc473acc73ba266c62cfef0fa207cfa99a27a903aeb6be1' 
  AND token = 'YUJJIc/VHfjFjnK3/FHiM4As0g4rXFofG5g2fWL7Hso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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