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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0355ace693a61eccd2d9cb28627c5e87d3b876d6a89d3384b53a4280c656bc1' 
  AND token = 'fo/Siq3fTUiembJP1tgLx9Y7uDDwQxh4cPktQa7bAuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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