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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0fcc22a50414f5578850779593e74364fef9d18571138cb7bf5ef7b9d55f45' 
  AND token = '/MIiAcpZrW5tvhrlmqJVdXo9TT8dyOkvbzSO9oDRNls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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