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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c8461efd3b23625968005a0a282a8f2d4e22f44e5cfbf82ced982aba3b3bc9' 
  AND token = '0uL6/r3hktM5S3cMHZzSCJCECPLEhhK5MJhAdxEfuWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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