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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140dc9795f4a760a74bf1ef27538cbc3cd630215b2b3d6d2188b8e6dff7ce7e6' 
  AND token = 'Q5WtE0k+pmnz1OcsLQH/Ttk+l9c0dj35WW0QbNbENmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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