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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696bdd60b417b3dc50c64099d08434d159fda7e5c60b9e50d633e962f9205242' 
  AND token = 'y7IDTCRnQZHGzX6OG9Ukm/bp8HVUD3zaP0tdP/0H0J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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