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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e79ece3a874c007c39d405dee9528b17c540289c2b386e770a806fa858ec2d' 
  AND token = '3MCVm0i1rqtmqEIZ/Sq4Zqpo9Ib6OrFXatMq512pMXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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