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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eed380d4309cbe40d6f1454bb6aac3f2f625ef688cde65cb1ada90f1171461' 
  AND token = '5PTz3oeDVOE29AxIJUb6hkHbbls9W9EfVYHqpwqgmaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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