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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e65fb7f1a1839dd4f73f642aac4edcb762d8df2041ec10668680557dfe40c77' 
  AND token = 'ZMVsLeseudBfE+gTw0MDzDGfy0Ln0gBsButJMlUOsCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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