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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28eca1cd78d46fa6d4d052d71ee50c96b748226b623730eb36ecd6fabafffb4' 
  AND token = 'kVV7xp5pRwUHWIz6iV6KpiJn6TrCcWUxBVagq9WiY24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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