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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1f34be72a04133a3aa0d78ed0010fee429d9d01488d95b9849cf392aa1fc83' 
  AND token = 'Y0nTX/rwpzSKKWbhqpoeUu9PplP5u9DgS79pOkPIz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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