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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208f97a65c9ada71c1043c5d0c5967fe5c93ef9f52580909bd7aa08e6d2dbd74' 
  AND token = 'KAHNuIz0E4b1XpnFgi1b82tw+xYguK0kNkEBzDDit9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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