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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b473283e07b3b3b2f7cb5974cf6b58dc85cb4aeb791fc0be2b8a83e9b91250' 
  AND token = 'w2xNQZd/Fy74tV71md7Vbypzg55u0D9TvmiM9hlzUS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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