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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfebfd6139bd36b3f8310dfe9c0fa42be11859f621d96632c7fb3b94f7457632' 
  AND token = '0YrzkZhsBKV4oZlNt9izvAbTeZ1dowyFMB4WEPgvaMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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