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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b024eea0c362b3c08616835f42d0110887880dcd81361353a953f839342325' 
  AND token = 'JlNSil0ge2SJo8Ot7Lwk4Gwy/rNrC4Ou31UPhdvDRUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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