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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f58a9334bbd38d1ddff62727ba09d7f4d4cb0a52779e23abf5ba3ec105fb262' 
  AND token = 'MBoLXlIHjvALXSIXM1+Z1eM8V93AnPOHLegfkfxRlwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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