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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e4174dcadf950166ecd7957136cd4cf6f9ffafa60f1973b1f23cec59ba425c' 
  AND token = 'd6fnraRKGOoOJJ+t7O/sSwVzVjEBv24R797LltLr6tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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