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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c12496f38d91d9b2186652d688c9915d4653e133de45cb9408113bee9432ef8' 
  AND token = 'UFHz2HvkmipY5qJDDMIJnleeSp5W2l8QhDq54+FkOGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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