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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649ea4f6d2190c3a090d857bae50138fc7cf245d376f8e3b9b2ef13c9a36a66d' 
  AND token = 'viJ3ouxGRDWXABuBCZApRmAkMX9ZIxP2rzdptfHpbVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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