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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f278135aaaec5130a8e90d617617c71a68305ac4fb8a368addc349ba9001f11' 
  AND token = 'VBaQkaqNRC69OUocmDWnWhIviSxog5SxYiTm0P8djyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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