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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a09cff40f3815f9e4b5d363f5e23a78d67601f39250a8a315f84dbc772d48d' 
  AND token = 'LTmWiAd+pe5/aVWbfc8VqDTR/flniW1xJfNDl4dwc+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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