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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827c8ac085ec483b073942c48fc7edcbc5f6dbcd5febe84a3fda34763ac5f610' 
  AND token = 'ZvNz7uTPTzqwaaZOOWnIZqxlA1w0AxGq5XaRzUsl7h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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