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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745fd1c34ef78db41b2f5a1ed12456831795fbbb64b352cda337199b3a77929a' 
  AND token = 'UtTJhKD0T1dgY8EWApONC4MY9Jrz/mqk/e1LZLm7LoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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