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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cddb82790fbc34c65990e0d98fff7824ee387881cbe6033e3393fd455c09d9' 
  AND token = 'V6CDi0N6C6cEer/a2et300LN9OwtY2jlfTjLGb2XFmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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