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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4d2064cfea04833564be43cba4adf15ef81ddead0b0b1b49dea8e4609ff759' 
  AND token = 'evkEWoxcpz7rRIJzS55j08Nvyis/U+qrm1g5pi9+tRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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