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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312e837d05a88faad20f3c31d2a62add726dea311d7f63dc544e2334b654d732' 
  AND token = 'sQoLUal+A+jIA1ACSB4Ason+d2hGnESk2WRaGfj3qxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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